The brain and spinal cord communicates with what is occurring in the internal organs and limbs by nerve fibers where are like electrical wires with insulation (myelin) and the "copper" (axon). Within brain and spinal cord these nerves connect to other nerves via synapses on both axons and dendrites. A nerve can carry information regarding sensations, and also commands for function.
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2

MANY CONSIDERATIONS:
A ruptured disc in neck, thoracic outlet syndrome, pectoralis minor syndrome, parsonage turner syndrome, all could be considered. Even carpal tunnel may refer pain upwards, but not usually into neck. Shoulder, neck, and blade pain may be seen with internal shoulder derangements, such as rotator cuff tear. With all these thoughts, see your physician and pin this down. Then treat it.
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Further treatment:
There are more aggressive treatment options for the spine that are more powerful than using over the counter medications, but they get progressively more involved. From non invasive alternatives such as physical therapy or chiropractic care, to interventional pain procedures which are invasive but non surgical, to even surgical considerations. I would not hesitate to be seen to discuss options.
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6

Discuss with MD:
You have a lot going on for your age, please discuss this with your doctor, you may warrant some further testing. This is not a good forum for this question as we can not diagnose "pinched nerve" without examination and testing. Your doctor may order a nerve conduction test coupled with an emg, or an MRI if they have not done so already. Discuss with your doctor.
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8

Ulnar nerve Sx:
It is most likely that ur gerd is giving you the chest pain rather than your ulnar nerve. Patients w/ulnar nerve compression can have pain, numbness, tingling, cold hands/arms, neck ; shoulder pain; just about any symptom from the fingertips to the neck, but not chest pain. A good way to find out is to have a physician block (numb up) your ulnar nerve and see what sx go away.
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9

See an orthopedist:
Neck pain commonly is due to muscle spasms, poor posture, arthritis, herniated disks etc. Shoulder pain can be referred from the neck or it could be locally from the shoulder. Common local problems include but not limited to spasms, arthritis in the ball and socket or ac joint, bursitis, impingement, rotator cuff tear, labral tears, biceps problems, stiffness, and instability. See an orthopedist.
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10

Check with your doc:
If this is newly developing, there sometimes may be fluid collection around the liver after the surgery. There are different things that can lead to this, so difficult to tell you simply hear. But the sensory nerves for that part of the body refer pain to the right shoulder - so the right shoulder pain has to do with the area around the liver.
Definitely speak with your physician.
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Shoulder pain is multifactorial. It can be from bone issues -- like arthritis. It can be from muscle tendon issues -- like a torn rotator cuff, or when a tendon is inflammed. It can also be from nerve issues -- like a bulging disk in your spine. Each diagnosis had a specific presentation.
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